"Natural Uranium" in solid form isn't really what I would call "highly reactive and dangerous to human life", so I don't find this statement to be that definitive.

"While the CDC has published one study that no human cancer has been seen as a result of exposure to natural or depleted uranium" -- wikipedia article on uranium.

So 7kg natural uranium is not something you want in your pocket, but not such a big deal either.

The main reason not to put it in your pocket is that it'll pull your pants down uncomfortably. You don't want to grind it into a fine powder and breathe that in, or ingest it, but the toxicity is a bigger threat than the radioactivity.